RLS5ZZ Sealed Ball Bearing 5/8" x 1 9/16" x 7/16" One Bearing RLS5ZZ Bearing is regular section, double Shielded, radial and deep groove ball bearing,RLS5ZZ bearing is made of Chrome Steel with chrome steel balls and steel cage,RLS5ZZ bearing is closed with Metal Shields to protect the bearing from dust or any possible contamination,RLS5ZZ bearing is Shielded and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,RLS5ZZ bearing is lubricated with grease.